How do I compute Net Borrowing Cost and use it in spread analysis?

Question

AcadiFi · Accepted Answer

Net Borrowing Cost (NBC) is the after-tax cost of net financing obligations, used in Penman's spread calculation.

Calypso Shipping NBC:
- Net Financial Expense (before tax): $48M - $6M = $42M
- After-tax NFE: $42M x (1 - 0.22) = $32.76M
- NBC = $32.76M / $650M = 5.04%

Economic meaning: NBC represents the blended after-tax cost of carrying net debt, netting interest received on financial assets against interest paid on financial liabilities. It's the 'hurdle rate' that operating returns must exceed for leverage to add value.

Spread = RNOA - NBC

If Calypso's RNOA is 11%:
- Spread = 11% - 5.04% = 5.96%
- With FLEV 0.42: leverage contribution = 0.42 x 5.96% = 2.50%
- ROE = 11% + 2.50% = 13.50%

Critical interpretation nuances:
- NBC < RNOA: leverage creates value (favorable spread)
- NBC > RNOA: leverage destroys value (negative spread) — common in distressed firms
- NBC should approximate weighted after-tax cost of net debt, typically 3-7% for investment-grade firms
- Cross-check NBC against treasury rates + credit spread to validate reasonableness

```mermaid
flowchart LR
    A[Interest Expense 48M] --> B[Net Expense 42M]
    C[Interest Income 6M] --> B
    B --> D[After-tax 32.76M]
    D --> E[NBC 5.04%]
    E --> F[Spread vs RNOA]
```

Analytical caution: if NBC appears abnormally low (e.g., 2% when treasuries are 4.5%), check for capitalized interest on long projects (shipping firms capitalize interest on vessel construction) — this understates period NBC and inflates the spread. Reverse out capitalized interest for steady-state analysis.

How do I compute Net Borrowing Cost and use it in spread analysis?

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